The Wadden Sea is an intertidal zone in the southeastern part of the North Sea. It is a shallow body of water with tidal flats and wetlands between the mainlands of the Netherlands, Germany, and Denmark, and the Frisian Islands. Since 2009, the Wadden Sea is on the UNESCO World Heritage List. There are seven national parks in the Wadden Sea region. Below is a list of these national parks and the main regions and islands surrounding the Wadden Sea.
- West Frisian Islands — the Dutch Wadden islands, of which five are inhabited.
- Province of Friesland — western part of the Dutch mainland Wadden Sea coast.
- Province Groningen — eastern part of the Dutch mainland Wadden Sea coast.
- State of Lower Saxony
- State of Hamburg
- Hamburg Wadden Sea National Park — including the tiny island of Neuwerk.
- State of Schleswig-Holstein